EASY
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Define the vapour pressure of a liquid. What happens to the vapour pressure when a volatile solute dissolves in the liquid.

Important Questions on Solutions

HARD
Chemistry>Physical Chemistry>Solutions>Colligative Properties
Mixture(s) showing positive deviation from Raoult's law at 35oC is (are)
MEDIUM
Chemistry>Physical Chemistry>Solutions>Colligative Properties
For an ideal solution, the correct option is:
MEDIUM
Chemistry>Physical Chemistry>Solutions>Colligative Properties
Solution A contains acetone dissolved in chloroform and solution B contains acetone dissolved in carbon disulphide. The type of deviations from Raoult’s law shown by solutions A and B, respectively are
HARD
Chemistry>Physical Chemistry>Solutions>Colligative Properties
Liquids A and B form ideal solution for all compositions of A and B at 25∘C. Two such solutions with 0.25 and 0.50 mole fractions of A have the total vapor pressures of 0.3 and 0.4 bar, respectively. What is the vapor pressure of pure liquid B in bar?
MEDIUM
Chemistry>Physical Chemistry>Solutions>Colligative Properties
Which one is not equal to zero for an ideal solution?
EASY
Chemistry>Physical Chemistry>Solutions>Colligative Properties
The mixture which shows positive deviation from Raoult’s law is
MEDIUM
Chemistry>Physical Chemistry>Solutions>Colligative Properties
The mixture that forms maximum boiling azeotrope is
MEDIUM
Chemistry>Physical Chemistry>Solutions>Colligative Properties
A solution contains 5 moles of X and 5 moles of Y, and has a normal boiling point of 90°C. The vapor pressure of pure X is 300 mm Hg. What is the vapor pressure of pure Y at this temperature?
EASY
Chemistry>Physical Chemistry>Solutions>Colligative Properties
Which one of the following is incorrect for ideal solution?
EASY
Chemistry>Physical Chemistry>Solutions>Colligative Properties
For an ideal solution of two components A & B, which of the following is true?
MEDIUM
Chemistry>Physical Chemistry>Solutions>Colligative Properties
Which of the following mixtures shows negative deviation from Raoult's law?
HARD
Chemistry>Physical Chemistry>Solutions>Colligative Properties
Liquids A and B form an ideal solution in the entire composition range. At 350K, the vapour pressure of pure A and pure B are 7×103Pa and 12×103Pa , respectively. The composition of the vapour in equilibrium with a solution containing 40 mole percent of A at this temperature is:
MEDIUM
Chemistry>Physical Chemistry>Solutions>Colligative Properties
Which of the following changes will cause increase in vapour pressure of 1 molal aqueous KI solution at same temperature?
MEDIUM
Chemistry>Physical Chemistry>Solutions>Colligative Properties
At 300 K, the vapour pressure of a solution containing 1 mole of n -hexane and 3 moles of n -heptane is 550 mm of Hg. At the same temperature, if one more mole of n -heptane is added to this solution, the vapour pressure of the solution increases by 10 mm of Hg. What is the vapour pressure in mmHg of n - heptane in its pure state______?
HARD
Chemistry>Physical Chemistry>Solutions>Colligative Properties

Benzene and toluene form an ideal solution over the entire range of composition. The vapour pressure of pure benzene and toluene at T K are 50 mmHg and 40 mmHg, respectively. What is the mole fraction of toluene in vapour phase when 117 g of benzene is mixed with 46 g of toluene?

(Molar mass of benzene and toluene are 78 and 92 g mol-1, respectively)

EASY
Chemistry>Physical Chemistry>Solutions>Colligative Properties
A pressure cooker reduces cooking time for food because
MEDIUM
Chemistry>Physical Chemistry>Solutions>Colligative Properties
Water +CH3OH mixture shows positive deviation from ideal solution behaviour 100 mL of water is mixed with 100 mL  of CH3OH. Then, total volume of the mixture will be
MEDIUM
Chemistry>Physical Chemistry>Solutions>Colligative Properties
The vapour pressures of pure liquids A and Bare 400 and 600 mm Hg respectively at 298 K. On mixing the two liquids, the sum of their volumes is equal to the volume of the final mixture. The mole fraction of liquid B is 0.5 in the mixture. The vapour pressure of the final solution, the mole fractions of components A and B in the vapour phase, respectively are 
MEDIUM
Chemistry>Physical Chemistry>Solutions>Colligative Properties
A solution at 20oC is composed of 1.5 mol of benzene and 3.5 mol of toluene. If the vapour pressure of pure benzene and pure toluene at this temperature are 74.7 torr and 22.3 torr respectively, then the total vapour pressure of the solution and the benzene mole fraction in equilibrium with it will be, respectively:
HARD
Chemistry>Physical Chemistry>Solutions>Colligative Properties
Which of the following statements about the composition of the vapour over an ideal 1 : 1 molar mixture of benzene and toluene is correct? Assume that the temperature is constant at 25oC . (Given vapour pressure data at 25oC , benzene = 12.8 kPa, toluene = 3.85 kPa)